Proper orbital elements

Frae Wikipedia, the free beuk o knawledge
Jump to navigation Jump to search

The proper orbital elements o an orbit are constants o motion o an object in space that remain practically unchynged ower an astronomically lang timescale. The term is uisually uised tae describe the three quantities:

  • proper semimajor axis (ap),
  • proper eccentricity (ep), an
  • proper inclination (ip).